P1478 — EVAP Emission Control System LDP Clamped Tube Detected

What Does P1478 Mean?

P1478 is a manufacturer-specific diagnostic trouble code: EVAP Emission Control System LDP Clamped Tube Detected. This code applies to VOLKSWAGEN, DODGE, JEEP, OTHER vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1478

⚠️ Check Engine Light (MIL) illuminated
⚠️ EVAP Emission Control System LDP Clamped Tube Detected not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty EVAP Emission Control System LDP Clamped Tube Detected
🔍 Wiring or connector issue in EVAP Emission Control System LDP Clamped Tube Detected circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1478 mean?

P1478 indicates: EVAP Emission Control System LDP Clamped Tube Detected. The vehicle's computer has detected that the EVAP Emission Control System LDP Clamped Tube Detected is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1478?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1478 for extended periods may cause additional problems.

How much does it cost to fix P1478?

Repair costs for P1478 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect EVAP Emission Control System LDP Clamped Tube Detected and related wiring
🔧 Replace faulty EVAP Emission Control System LDP Clamped Tube Detected

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1478: EVAP Emission Control System LDP Clamped Tube Detected